An improv comedy troupe made light of one of New York’s least pleasant summer experiences, the subway schvitz.

Improv Everywhere pranksters commandeered the uptown 34th Street N, R and Q station platform and ran an impromptu day spa — to the confusion and delight of overheated straphangers.

The day’s 85-degree heat of July 19 meant it was a sweltering 95 degrees down below, making an ideal setting for the group’s mock “34th Street Spa.”

Members of the troupe wrapped themselves in robes and towels, playing the roles of spa clients. The footage was posted on the group’s website on Tuesday.

“It’s very warm and humid down here,” one of the funny group’s leaders told bewildered subway riders. “We can’t provide air conditioning, so we’ve converted this space into a spa.”

They served lemon-lime-infused water, offered hot-stone therapy and “misting stations” for some cooling from the oppressive subway heat.

One courageous middle-aged woman took advantage of the hot-stone therapy and loved it: “That stone treatment was lovely.”

Cops warned comedians that they’d have to leave if anyone complained, according to Todd.

“They [police] were very polite,” group founder Charlie Todd told The Post on Tuesday.

“We had a polite interaction with them. We saw them laughing.”

The group shot an hour of footage before a station manager came downstairs, asking the comics to leave. But by that point, the group had all it needed.

Todd said he’d been considering this prank for years.

Like all subway riders, Todd has eagerly jumped into an empty subway car on a sweltering day without realizing there’s no AC.

“Every so often in the summer, you’ll accidentally step into a car with broken air conditioning, briefly considering yourself lucky to find an empty car before realizing the reason why it is empty,” he wrote on the group’s website.

“I never got around to staging this because I couldn’t logistically figure out how we’d be able to reliably find a car with broken A/C. Plus, there would be no audience, as no one in their right mind would enter the car.”

Then he realized where the perfect stage would be.

“The platform! Of course!” he wrote. “It’s reliably hot and there is no escape.”